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Roll up your sleeves

WESTPILE HAS used sleeved piles to prevent damage to a water tunnel running under a housing development in west London. The sleeves transfer loads further down the piles so the tunnel is unaffected by the new building.

Now in its sixth phase, St James Homes' Kew Riverside project comprises four- and fivestorey luxury apartment blocks on the Thames.

Westpile has been involved throughout. For this latest phase, the firm had to install 177 piles to support the new block, which includes a basement car park.

Work was complicated by the water tunnel running across the middle ofthe site, 6m down.

Sleeves were fitted to 29 of the piles installed either side ofthe tunnel. These are 3.5m long and integral with the 7m long reinforcement cages.

Piles were installed using a cased flight auger system to depths ofbetween 14m and 22m, depending on loading.

The cased CFA system ensures good verticality and precise load allocation, which are particularly useful where there are underground services and tunnels, said Westpile southern area manager Lyndon Bedford.

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